49
Fault-tracing
List of probable causes
1. Discharged battery
2. Loose connection/open-circuit
3. Fuse (in the relay box) blown.
4. Stop control pulled out
5. Inadequate pre-heating
6. Lack of fuel
7. Blocked fuel filter
8. Air in the fuel injection system
9. Water/contaminants in the fuel
10. Boat abnormally loaded
11. Fouling on underwater hull/drive/propeller
12. Limited speed control lever movement
13. Insufficient air supply
14. Engine coolant temperature is too high
15. Engine coolant temperature is too low
16. Lubricating oil level too low.
17. Blocked fuel filter
18. Defective/incorrect propeller
19. Defective engine mounting
20. Too little coolant
21. Blocked seawater intake/pipe/filter
22. Circulation pump drive belt slipping
23. Defective impeller
24. Defective/incorrect thermostat
25. Lubricating oil level too high
26. Generator drive belt slipping
Problem Probable cause
Starter motor not turning (or slow) 1, 2, 3
Engine fails to start 4, 5, 6, 7, 8, 9
Engine starts but stops again 6, 7, 8, 9
Engine is difficult to start 6, 7, 8, 9
Engine does not reach correct speed at wide open throttle (WOT) 7, 8, 9, 10, 11, 12, 13, 18
Engine knocks 14
Engine runs unevenly 6, 7, 8, 9, 13, 14
Engine vibrates 18, 19
High fuel consumption 10, 11, 13, 15, 18
Black exhaust smoke 5, 13, 15, 18
Blue or white exhaust smoke 15, 25
Low oil pressure 16, 17
Engine coolant temperature too high 20, 21, 22, 23, 24
No or poor charging 2, 26
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